private void ScanThreadProc() { lock (m_syncRoot) { Debug.WriteLine("+WiFiService.ScanThreadProc"); Scanning = true; do { if (m_wzc == null) { break; } if (!WiFiEnabled) { break; } try { var et = Environment.TickCount; if (m_currentAPs == null) { m_currentAPs = m_wzc.NearbyAccessPoints; } else { m_currentAPs.Refresh(); } if (!WiFiEnabled) { break; } var added = m_currentAPs.Except(m_knownAPs); var lost = m_knownAPs.Except(m_currentAPs); var updated = m_knownAPs.Intersect(m_currentAPs); m_knownAPs = m_currentAPs.ToList(); RaisePropertyChanged("KnownAPs"); var handler = ScanComplete; et = Environment.TickCount - et; Debug.WriteLine(string.Format("Network scan took {0}ms", et)); if (!WiFiEnabled) { break; } if (handler != null) { ThreadPool.QueueUserWorkItem(delegate { handler(added.ToArray(), lost.ToArray(), updated.ToArray()); }); } } catch (Exception ex) { Debug.WriteLine(string.Format("Exception in WiFi network scan. If you disabled the adapter, you can ignore this error: ", ex.Message)); // if we disable the WiFi adapter while this loop is executing, bad things can happen // it's better to just catch around the whole thing and ignore if (!WiFiEnabled) { break; } } } while (!m_stopScanEvent.WaitOne(ScanPeriod, false)); Debug.WriteLine("-WiFiService.ScanThreadProc"); Scanning = false; m_currentAPs = null; } }
internal unsafe void RefreshListPreferred(bool nearbyOnly) { // If the caller wants only the local preferred APs, // we check nearby list and, if the AP is not there, // we don't add it to our own preferred list. AccessPointCollection apc = null; if (nearbyOnly) { apc = adapter.NearbyAccessPoints; } // First step is to get the INTF_ENTRY for the adapter. // This includes the list of preferred SSID values. INTF_ENTRY ie = INTF_ENTRY.GetEntry(this.adapter.Name); // The field rdStSSIDList is the preferred list. It comes // in the form of a WZC_802_11_CONFIG_LIST. RAW_DATA rd = ie.rdStSSIDList; WZC_WLAN_CONFIG_LIST cl = new WZC_WLAN_CONFIG_LIST(rd); // Step through the list and add a new AP to the // collection for each entry. for (int i = 0; i < cl.NumberOfItems; i++) { WZC_WLAN_CONFIG c = cl.Item(0); // Get a NDIS_WLAN_BSSID corresponding to the // part of the WZC_WLAN_CONFIG entry and use that // to build an AccessPoint instance for this // entry. NDIS_WLAN_BSSID bssid = c.ToBssid(); // If we're only showing those which we can hear, // see if the current SSID is in the nearby list. if (nearbyOnly) { // Find the currently active AP with the SSID // to match the one we're working on. AccessPoint activeAP = apc.FindBySSID(bssid.SSID); int ss; // If the given SSID is not in range, don't add // an entry to the list. if (activeAP != null) { // Update signal strength. ss = activeAP.SignalStrengthInDecibels; // Copy the signal strength value to the // NDIS_WLAN_BSSID structure for the // preferred list entry. bssid.Rssi = ss; // Create the AP instance and add it to the // preferred list. AccessPoint ap = new AccessPoint(bssid); this.List.Add(ap); } } else { // Create the AP instance and add it to the // preferred list. The signal strength will // not necessarily be valid. AccessPoint ap = new AccessPoint(bssid); this.List.Add(ap); } } }